Thread: ducting and airflow - have I really understood............

Originally Posted by mick59wests

For the lathe I plan on two separate outlets - one for when turning between centres (or on a faceplate / screw chuck) and a separate one when doing the inside of bowls. I know I cannot have both on at once as I have already restricted my airflow by this time. For inside of bowls I have a separate outrigger and a swivel head so will turn the headstock 90 degrees (being left handed this is great for me). I actually plan to use the main rest as the pivot for the bit of flexi (planning to fit a bell shaped end on it) for this. The rest is nice and solid and can adjust in all directions. I digress (but would be very interested in comments on this) as mostly I was wanting opinion on the bandsaw (which will extend to other machines which have more than one point of dust capture).....

If one inlet is on a bit of flexi why not lengthen the flex a bit so it can move to cover both the "turning between centres" and "bowls"?
It will declutter the area around the lathe quite a bit.

OK...as my machine is capable of enough suck to handle a 225mm pipe it can handle 2 x 150mm pipes. My bandsaw has a 100mm dust extraction port so my plan is to....
- use a 150mm pipe at the top of the bandsaw (BS)
- split another 150mm to 2 x 100mm and put one in the dust extraction port and the other below the BS table

I'd swap the 150 so it would be under the table. That is where most of the dust ends up. Fitting it will be tricky but some sort of collar would probably work.

Originally Posted by BobL

If one inlet is on a bit of flexi why not lengthen the flex a bit so it can move to cover both the "turning between centres" and "bowls"?
It will declutter the area around the lathe quite a bit.

That was my initial thought but having 2 outlets means I can basically have the 'turning between centres' setup permanently with very little adjustment each time. This should also mean very little flexi The 'inside bowl' outlet will need to be moved more often and have a longer flexi run. I am also thinking of doubling this one for use with my drill-press.

Originally Posted by BobL

I'd swap the 150 so it would be under the table. That is where most of the dust ends up. Fitting it will be tricky but some sort of collar would probably work.

.
Thanks. I will go back to other posts (John Samuel's for one) on actual connections to the bandsaw as I get closer.

As an aside, I did not plan for the ducting to be as low as it is but it does mean that the blast gates can be kept in the same horizontal plane as the mainline and I can still reach them easily.

I also hope that people noticed the modern sketchup that I was using which makes drawings appear as if they are hand drawn

cheers

Mick

[QUOTE=mick59wests;1771004]That was my initial thought but having 2 outlets means I can basically have the 'turning between centres' setup permanently with very little adjustment each time. [QUOTE]
Makes sense.

This should also mean very little flexi The 'inside bowl' outlet will need to be moved more often and have a longer flexi run.

An extra meter of flex is not going to make that big a difference. More important is to use some sort of a Bell Mouth Hood for these.

I am also thinking of doubling this one for use with my drill-press.

Good idea.

As an aside, I did not plan for the ducting to be as low as it is but it does mean that the blast gates can be kept in the same horizontal plane as the mainline and I can still reach them easily.

A run of mine is quite low and one thing I don't like about it is that it blocks lighting.

I also hope that people noticed the modern sketchup that I was using which makes drawings appear as if they are hand drawn

I have had another thought for the lathe.....

If I split the ducting (like I am planning for the bandsaw) so I could have 2 x 150 outlets running at once (ie: split from the 22mm to 2 x 150mm) then I would gain the following flexibility:
- If I was doing a fairly long turning between centres I could have both outlets running at once. The best setup for this would be interesting as you do not really want them competing but if they were side by side and perhaps 100mm apart I expect this would be pretty good. Perhaps even a frame to hold the two outlets.
- as a secondary air scrubber, I could keep the second outlet close to where I am working. With the inside of bowls, there may a good position for the second outlet.

Any other thoughts / has anyone done this before most appreciated.

I did think of doing a 225mm to the lathe but the extra cost (and I have not even seen 225mm flexi) put me off.

cheers

Mick